Families tend to want to treat themselves and their kids well, and the Honda Odyssey offers many trim levels that let them do just that. But the difference between a base Odyssey and a fully decked-out one can be $10,000 new, so shop carefully to get a sense of which options will cost you more on a used Odyssey and which aren’t valued highly by the used-car market. For instance, do you really need power-operated sliding side doors?